CN105557023B - Wireless telecommunications network node and method - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
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- H—ELECTRICITY
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- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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Abstract
Wireless telecommunications network nodes, methods and computer program products are disclosed. A method for a wireless telecommunications network node, comprising: determining a cause of a radio failed link that occurs when a user equipment is in the vicinity of an uplink-downlink imbalance region; and in response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region. In this way, by establishing the cause of the radio link failure, action can be taken to change the user equipment uplink-downlink decoupling-recoupling process to help prevent such radio link failure from occurring in the future.
Description
Technical Field
The present invention relates to a wireless telecommunications network node, a method and a computer program product.
Background
Wireless telecommunications networks are known. In such networks, a mobile communication device (e.g., a mobile phone) is operable to communicate with a base station provided by a network provider.
In known wireless telecommunications networks, radio coverage is provided to network connectable devices such as mobile phones or wireless devices such as tablets within an area known as a cell. A base station is located in each cell to provide radio coverage. Typically, the network-connectable devices in each cell are operable to receive information and data from a base station and to transmit information and data to the base station.
The user equipment roams through a wireless communication network. Base stations are typically provided that support a radio coverage area. Many such base stations are provided and geographically distributed in order to provide a large coverage area for user equipment.
When the user equipment is within the area served by the base station, communication may be established between the user equipment and the base station over the associated radio link.
Conventional base stations provide coverage in a relatively large geographic area, and these cells are often referred to as macrocells. Heterogeneous networks (hetnets) can be provided in which smaller sized cells are provided within a macrocell. Such smaller size cells are sometimes referred to as Low Power Nodes (LPNs), micro cells, pico cells, or femto cells. One way to establish small cells is to provide a small cell base station that provides coverage with a relatively limited range within the coverage area of a macro cell. The transmission power of small cell base stations is relatively low and, therefore, each small cell provides a smaller coverage area than a macro cell and covers, for example, an office or a home.
Such small cells are typically provided when the communication coverage provided by the macro cell is poor, or when a user wishes to communicate with the core network using an alternative communication link provided locally by the small cell base station, and/or to increase capacity within the network.
The deployment of small cells in a wireless communication network may facilitate networks related to processing capacity in high traffic areas (e.g., so-called hot spot areas). The ability to offload traffic to one or more small cells located in a high traffic area of the network may be particularly practical for network operators.
While HetNet deployments may provide advantages, undesirable consequences of such deployments may occur. It is desirable to address these consequences.
Disclosure of Invention
According to a first aspect, there is provided a method of a wireless telecommunications network node, comprising: determining a cause of a radio link failure occurring when a user equipment is near an uplink-downlink imbalance region; and in response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region.
Small cells have extensive auto-configuration and self-optimization capabilities for enabling simple plug and play deployment and are designed to integrate them automatically into existing macro cellular networks. A network in which both small cells and macro cells are deployed is called a heterogeneous network (HetNet).
In HetNet deployments, small cells are deployed under macro cell coverage to improve coverage and/or capacity of the system. Fig. 1 illustrates a HetNet deployment with macro and small cells. In the figure, the UL (uplink) boundary is where the UE uplink pathloss to the macro cell and the UE uplink pathloss to the small cell are the same. The pilot power received from the macro cell and the pilot power received from the small cell at the DL (downlink) boundary are at the same location at the UE. This is in contrast to homogeneous networks (i.e., deployment of only macro cells), where the UL and DL boundaries are at the same point in the network. However, in HetNet deployments, small cells have lower transmit power than macro cells. As a result, the UL and DL boundaries are different, as shown in fig. 1. The region between the UL and DL boundaries is referred to as a UL-DL imbalance region.
A UE in an UL-DL imbalance region that is connected to a macro cell (as shown in figure 1) will generate strong interference to a small cell. This scenario applies to both LTE and UMTS radio access technologies. In UMTS, if the UE is not in a SHO (soft handover) area, as shown in fig. 1, strong uplink interference will occur.
Given the difference in UL and DL boundaries, uplink and downlink decoupling is proposed, whereby uplink and downlink flows are served by different cells. In the example of figure 1, the downlink is served by the serving macro cell and the uplink is served by the small cell. Thus, instead of generating strong interference to the small cell, the small cell demodulates the UL signal for the UE.
However, the first aspect recognises that there is no known solution for describing the detection of problems that may occur when a UL-DL imbalance region is established.
Accordingly, a method for a wireless telecommunications network node is provided. The method may comprise the steps of: a possible cause or cause of a radio failed link that occurs when a user equipment is near an uplink-downlink imbalance region is determined or established. It should be understood that a user device is in the vicinity of such an area when the user device is adjacent to, near, or within the area. The method may further comprise the steps of: when the cause of the radio link failure has been determined, an action is initiated or started that optimizes or adjusts the control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region. In this way, by establishing the cause of the radio link failure, action can be taken to change the user equipment uplink-downlink decoupling-recoupling process to help prevent such radio link failure from occurring in the future.
In one embodiment, wherein the step of determining comprises: determining that a radio link failure occurred in the uplink due to one of a premature or late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling; and the step of initiating an action comprises: optimizing control of the user equipment to perform a respective one of uplink-downlink decoupling and uplink-downlink recoupling at a respective one of later and earlier than before. Thus, it can be determined that decoupling or recoupling occurs too early or too late, and this results in a radio link failure. The method may also include taking some action to optimize or adapt the decoupling or recoupling process to be performed later or earlier than what is currently occurring. In other words, if it has been determined that decoupling or recoupling occurred too early, decoupling or recoupling is optimized to occur later. Similarly, if decoupling or recoupling occurs too late, it is optimized to occur earlier.
In one embodiment, the step of determining comprises: when the network node receives an amount of interference above a threshold on the uplink and then switches the user equipment to the network node with a concomitant reduction in interference, it is determined that a radio link failure occurred in the uplink due to uplink-downlink decoupling occurring too late, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling earlier than previously.
In one embodiment, the step of determining comprises: when, after uplink-downlink recoupling of the user equipment, the network node receives an amount of interference above a threshold on the uplink and then switches the user equipment to the network node with a concomitant reduction in interference, it is determined that a radio link failure occurred in the uplink due to the uplink-downlink recoupling occurring too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform the uplink-downlink recoupling later than previously.
In one embodiment, the step of determining comprises: when a radio link failure in the uplink occurs after uplink-downlink re-coupling of the user equipment after an amount of time greater than a threshold after uplink-downlink decoupling of the user equipment, determining that the radio link failure occurred in the uplink due to the uplink-downlink re-coupling occurring too late, and the step of initiating action comprises: the control of the user equipment is optimized to perform the uplink-downlink recoupling earlier than previously.
In one embodiment, the step of determining comprises: when a radio link failure in the uplink occurs within a threshold amount of time after uplink-downlink decoupling of the user equipment, determining that the radio link failure occurred in the uplink due to the uplink-downlink decoupling occurring too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling later than before.
In one embodiment, the step of determining comprises determining that a radio link failure has occurred in the downlink in response to a radio link failure message received from the user equipment. Thus, the occurrence of a radio link failure may be indicated by receiving a message from the user equipment.
In one embodiment, the radio link failure message indicates one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling, and the step of initiating the action comprises: optimizing control of the user equipment to perform, in response to the radio link failure message, a respective one of uplink-downlink decoupling and uplink-downlink recoupling at a respective one of later and earlier than previously. Thus, the message may indicate the cause of the radio link failure, and corresponding actions may be taken to configure the decoupling or recoupling to occur at different times.
In one embodiment, the radio link failure message comprises at least one of an indication of a downlink serving cell and an uplink serving cell at the time of the radio link failure.
In one embodiment, the step of initiating an action comprises: providing an indication of at least one of a cause and an action of a radio link failure to a network node responsible for control of user equipment uplink-downlink decoupling-recoupling when in proximity to an uplink-downlink imbalance region. Thus, the network node responsible for controlling the decoupling or recoupling process is informed that a failure has occurred so that the network node can take appropriate action.
In one embodiment, the step of determining comprises: determining that a radio link failure occurs in the uplink in response to at least one of a cause of the radio link failure and an indication of an action received from another network node.
In one embodiment, the step of initiating an action comprises: when more than a threshold amount of radio link failures are determined, an action is initiated to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of an uplink-downlink imbalance region. Thus, instead of responding to every radio link failure, a threshold may be defined beyond which optimization will occur. This helps to improve the stability of the network.
In one embodiment, the step of initiating an action comprises adjusting at least one of: defining an uplink boundary and a downlink boundary of an uplink-downlink imbalance region; and a parameter triggering uplink-downlink decoupling-recoupling of the user equipment. Thus, the transmission power may be adjusted to change the location of the uplink and/or downlink boundaries. Similarly, a parameter, such as a threshold, with which the user equipment performs its various measurement reports that trigger decoupling or recoupling, may be adjusted to facilitate a change when the decoupling or recoupling process is initiated.
According to a second aspect, there is provided a wireless telecommunications network node comprising: determining logic operable to determine a cause of a radio link failure occurring when the user equipment is in the vicinity of an uplink-downlink imbalance region, and in response to the cause of the radio link failure, to initiate an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink due to one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling, and to optimize control of the user equipment to perform the respective one of uplink-downlink decoupling and uplink-downlink recoupling at the respective one of later and earlier than before.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink due to uplink-downlink decoupling occurring too late when the network node receives an amount of interference above a threshold on the uplink followed by a handover of the user equipment to the network node with reduced interference, and to optimize control of the user equipment to perform uplink-downlink decoupling earlier than previously.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink due to uplink-downlink recoupling occurring too early when the network node receives an amount of interference above a threshold on the uplink following uplink-downlink recoupling of the user equipment and then switches the user equipment to the network node with concomitant reduction in interference, and to optimise control of the user equipment to perform uplink-downlink recoupling later than previously.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink due to uplink-downlink recoupling occurring too late when a radio link failure occurred in the uplink after user equipment uplink-downlink recoupling after an amount of time greater than a threshold after uplink-downlink decoupling of the user equipment, and to optimize control of the user equipment to perform uplink-downlink recoupling earlier than previously.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink due to uplink-downlink recoupling occurring too early when the radio link failure occurred in the uplink within a threshold amount of time after uplink-downlink decoupling of the user equipment, and to optimize control of the user equipment to perform uplink-downlink decoupling later than previously.
In one embodiment, the determination logic is operable to determine that a radio link failure has occurred in the downlink in response to a radio link failure message received from the user equipment.
In one embodiment, the radio link failure message indicates that one of the uplink-downlink decoupling and the uplink-downlink recoupling occurred one of too early and too late, and the determination logic is operable to optimize control of the user equipment to perform, in response to the radio link failure message, the respective one of the uplink-downlink decoupling and the uplink-downlink recoupling later and earlier than the respective one before.
In one embodiment, the radio link failure message comprises at least one of an indication of a downlink serving cell and an uplink serving cell when a radio link failure occurs.
In one embodiment, the determination logic is operable to initiate an action to optimize control by: providing an indication of at least one of a cause and an action of a radio link failure to a network node responsible for control of user equipment uplink-downlink decoupling-recoupling when in proximity to an uplink-downlink imbalance region.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the uplink in response to at least one of a cause of the radio link failure and an indication of an action received from another network node.
In one embodiment, the determination logic is operable to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region when more than a threshold amount of radio link failures are determined.
In one embodiment, the determination logic is operable to initiate the action by adjusting at least one of: defining an uplink boundary and a downlink boundary of an uplink-downlink imbalance region; and a parameter triggering uplink-downlink decoupling-recoupling of the user equipment.
According to a third aspect, there is provided a wireless telecommunications user equipment method comprising: determining a cause of a radio link failure occurring when a user equipment is in the vicinity of an uplink-downlink imbalance region; and in response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region.
In one embodiment, the step of determining comprises: determining that a radio link failure occurred in the downlink due to one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling; and the step of initiating an action comprises: transmitting a radio link failure message indicating one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling.
In one embodiment, the step of determining comprises: when a radio link failure occurs in the downlink after a threshold amount of time after uplink-downlink decoupling of the user equipment, determining that the radio link failure occurred in the downlink due to uplink-downlink recoupling occurring too late, and the step of initiating action comprises: the control of the user equipment is optimized to perform the uplink-downlink recoupling earlier than previously.
In one embodiment, the step of determining comprises: when a radio link failure occurs in the downlink within a threshold amount of time after uplink-downlink recoupling to a cell that previously received the uplink, it is determined that the radio link failure occurred in the downlink due to the uplink-downlink recoupling occurring too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform the uplink-downlink recoupling later than previously.
In one embodiment, the step of determining comprises: when a radio link failure occurs in the downlink within a threshold amount of time configured after uplink-downlink decoupling but before uplink-downlink decoupling occurs, determining that the radio link failure occurred in the downlink due to uplink-downlink decoupling occurring too late, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling earlier than previously.
In one embodiment, the step of determining comprises: when a radio link failure occurs in the downlink within a threshold amount of time after initiating uplink-downlink decoupling, determining that the radio link failure occurred in the downlink due to the uplink-downlink decoupling occurring too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling later than before.
In one embodiment, the radio link failure message includes at least one of an indication of a downlink serving cell and an uplink serving cell when the radio link failure occurs.
According to a fourth aspect, there is provided a wireless telecommunications user equipment comprising: determining logic operable to determine a cause of a radio link failure occurring when the user equipment is in the vicinity of an uplink-downlink imbalance region, and in response to the cause of the radio link failure, to initiate an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of the uplink-downlink imbalance region.
In one embodiment, the determination logic is operable to determine that a radio link failure occurred in the downlink due to one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling, and initiate the action by transmitting a radio link failure message indicating one of a premature and a late occurrence of one of uplink-downlink decoupling and uplink-downlink recoupling.
In one embodiment, the determination logic is operable, when a radio link failure occurs in the downlink after a threshold amount of time following uplink-downlink decoupling of the user equipment, to determine that the radio link failure occurred in the downlink due to uplink-downlink recoupling occurring too late, and to initiate the action by optimising control of the user equipment to perform uplink-downlink recoupling earlier than previously.
In one embodiment, the determination logic is operable, when a radio link failure occurs in the downlink within a threshold amount of time after uplink-downlink recoupling to a cell that previously received the uplink, to determine that the radio link failure occurred in the downlink due to uplink-downlink recoupling occurring too early, and to initiate the action by optimising control of the user equipment to perform uplink-downlink recoupling later than previously.
In one embodiment, the determination logic is operable, when a radio link failure occurs in the downlink within a threshold amount of time configured after uplink-downlink decoupling but before uplink-downlink decoupling occurs, to determine that the radio link failure occurred in the downlink due to uplink-downlink decoupling occurring too late, and to initiate the action by optimizing control of the user equipment to perform uplink-downlink decoupling earlier than previously.
In one embodiment, the determining logic is operable, when a radio link failure occurs in the downlink within a threshold amount of time after initiating uplink-downlink decoupling, to determine that the radio link failure occurred in the downlink due to uplink-downlink decoupling occurring too early, and to initiate the action by optimizing control of the user equipment to perform uplink-downlink decoupling later than previously.
In one embodiment, the radio link failure message includes at least one of an indication of a downlink serving cell and an uplink serving cell when the radio link failure occurs.
According to a fifth aspect, there is provided a computer program product operable, when executed on a computer, to perform the method steps of the first or third aspect.
Other specific and preferred aspects are set out in the accompanying independent and dependent claims. Features of the dependent claims may be combined with features of the independent claims as appropriate and in combinations other than those explicitly set out in the claims.
When an apparatus feature is described as being operable to provide a function, it should be understood that this includes apparatus features that provide the function or are adapted or configured to provide the function.
Drawings
Embodiments of the invention will now be described further with reference to the accompanying drawings, in which:
fig. 1 illustrates an uplink-downlink imbalance region; and
fig. 2 illustrates uplink-downlink decoupling.
Detailed Description
SUMMARY
Before discussing the embodiments in any more specific manner, an overview will first be provided. Embodiments provide a technique by which the cause or cause of a radio link failure is identified and this additional information is utilized to improve the operation of uplink-downlink decoupling or recoupling. In particular, the following logic is provided within the user equipment and the network: the logic identifies when a radio link failure occurs, whether the user equipment is in an uplink-downlink imbalance region, and if so, determines a possible cause of the radio link failure. The cause may then be signaled to a network node (such as a base station) responsible for controlling the operation of the decoupling or recoupling process, so that the process may be optimized to prevent such radio link failure from occurring in the future. Often, a failure occurs because the decoupling or recoupling process occurs too early or too late. The optimization changes the transmission power such that the location of the uplink or downlink boundary moves, or changes parameters within the user equipment that trigger various measurement reports to be sent that initiate the decoupling or recoupling process. These optimizations help to ensure that the decoupling or recoupling process occurs at the correct time in order to reduce the incidence of such radio link failures in the future.
Embodiments introduce logic in the user equipment and the network for detecting (uplink-downlink) UL-DL decoupling problems and then use the results of this detection to appropriately adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL decoupling and/or re-coupling.
One of the possible impacts of networks with UL-DL imbalance areas that do not have the best configuration is the increased prevalence of user equipments experiencing downlink Radio Link Failure (RLF), particularly when these user equipments are moving near or in the UL-DL imbalance area. Similarly, there may be an increased prevalence of networks experiencing uplink RLF from user equipments again near or in the UL-DL imbalance region.
Thus, embodiments provide logic to detect RLFs that are likely to have resulted from incorrectly configured UL & DL boundaries and/or UL-DL decoupling/recoupling parameters, and then use this information to optimize the boundaries of the imbalance region and/or adjust the UL-DL decoupling/recoupling parameters.
For UL-DL decoupling activation (decoupling) & decoupling deactivation (recoupling), there are scenarios that are relevant for UL & DL. In the context defined below, it is understood that references to RLF are generic and refer to:
a) a specific user equipment (RLF) reporting feature for Long Term Evolution (LTE) network deployment; or
b) Reception of a Radio Resource Connection (RRC) cell update message from a user equipment by a Radio Network Controller (RNC), wherein for a Universal Mobile Telecommunications System (UMTS) deployment, the cause is set to "RadioLinkFailure".
Downlink failure
For the DL, a range of possible reportable RLFs is defined for each of which a respective optimization for the UL-DL configuration is possible.
1) UL-DL recoupling (de-coupling deactivation) occurs too late
In this scenario, the downlink of the user equipment is handled by cell a and the uplink is handled by cell B. This late deactivation is detected by logic on the user equipment when DL RLF occurs after the user equipment has an existing active configuration for UL-DL decoupling and has been processing downlink by cell a and uplink by cell B for a long period of time; in this scenario, the UE will attempt to re-establish the entire radio link connection to cell B or cell a. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL re-coupling such that UL-DL re-coupling occurs earlier than currently configured.
2) UL-DL recoupling (de-coupling deactivation) is triggered prematurely
In this case, the downlink of the user equipment is handled by cell a and the uplink is handled by cell B. When the UL-DL decoupling has been deactivated at the base station (eNB) such that both DL and UL are handled by cell B (i.e. when UL & DL is re-coupled and handled by cell B) soon after DL RLF occurs in the user equipment, the early deactivation is detected by logic on the user equipment. The optimization is to adjust the boundary of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL re-coupling such that UL-DL re-coupling occurs later than currently configured.
3) Too late UL-DL decoupling activation occurs
Shortly after the base station (eNB) has configured the user equipment for UL-DL decoupling, but the decoupling has not yet been activated, DL RLF is detected in the user equipment. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL re-coupling such that UL-DL decoupling occurs earlier than currently configured.
4) UL-DL decoupling activation is triggered prematurely
DL RLF is detected by the user equipment shortly after the UL-DL has been decoupled, or the failure actually occurs during activation of the decoupling procedure; the user equipment will attempt to re-establish the radio link connection to the originally coupled cell. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL decoupling such that the UL-DL decoupling occurs later than currently configured.
It should be appreciated that a failure during the UL-DL decoupling activation procedure may be detected when the user equipment does not receive an ACK or NACK on the DL.
For the above four scenarios, the user equipment will typically provide a new RLF report to the base station (eNB) after a successful RRC re-establishment (for LTE deployment) or the UE may provide a new RLF report to the base station (node B) during a successful cell update procedure (for UMTS deployment). The RLF report will typically indicate the possible cause of the failure and/or the possible optimization. The radio measurements contained in the RLF reports may be used by logic introduced in the network to identify UL-DL imbalance regions as possible causes of failure.
Thus, embodiments provide logic in a user equipment that will provide additional information to the network when RLF is detected, a new information element is introduced into the user equipment's RLF-report message or cell update message to show that RLF is due to UL-DL decoupling and to enable the user equipment to provide a UL cell identifier.
Further, embodiments introduce logic in the network such that a cell receiving an RLF-report from the user equipment will forward the information received from the user equipment in an RLF INDICATION (RLF INDICATION) type message to the cell that sent the previous HS-SCCH order to activate or deactivate UL-DL decoupling. Alternatively, if the cell receiving the RLF report is a cell that activates or deactivates UL-DL decoupling, it will itself use the information provided by the user equipment.
Uplink failure
For the UL, a range of possible reportable RLFs is defined for each of which a respective optimization for the UL-DL configuration is possible.
1) Too late UL-DL decoupling activation occurs
This is detected in the small cell, which experiences strong UL interference from the user equipment, after which the user equipment is handed over from the neighboring macro cell and the strong UL interference is removed. The small cell may assume that the user equipment generating the strong interference has now been handed over to the small cell. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL decoupling such that the UL-DL decoupling occurs earlier than currently configured.
In UMTS where Soft Handover (SHO) is available, the small cell will be able to demodulate the user equipment uplink signal. If the user equipment pilot power is reduced (by Inner Loop Power Control (ILPC)) by an amount greater than a threshold, e.g., by using the difference between the user equipment pilot power when the user equipment just added the small cell to the active set and the user equipment pilot power when the UL-DL decoupling activation occurred, the UL-DL decoupling activation is considered too late.
Another approach in SHO-enabled UMTS is when the uplink signal of the serving macro cell falls below the threshold at which UL-DL activation occurs.
2) UL-DL recoupling (de-coupling deactivation) is triggered prematurely
This is detected in the small cell, which experiences strong UL interference from the user equipment shortly after UL-DL decoupling deactivation (both links are re-coupled back to the macro cell), after which the user equipment is handed over from the neighboring macro cell and the strong UL interference is removed. The small cell may assume that the user equipment generating the strong interference has now been handed over to the small cell. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL decoupling such that UL-DL re-coupling occurs later than currently configured.
In both cases described above, the embodiments utilize logic on the small cell base station to determine when these problems occur, and further, send an RLF indication type message to the macro cell prior to handover, which message includes information to inform the small cell that it has determined that UL-DL decoupling has been activated too late or recoupled too early.
3) UL-DL recoupling (de-coupling deactivation) occurs too late
Shortly after the existing decoupling of the user equipment is deactivated (i.e. the UL-DL is re-coupled), RLF on UL is detected in the macro cell or the small cell. Instead, the existing activation configuration for UL-DL decoupling exists for a long period of time, and then the RLF is detected by the macro cell or the small cell. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL re-coupling such that UL-DL re-coupling occurs earlier than currently configured.
4) UL-DL decoupling activation is triggered prematurely
RLF on UL is detected in the macro cell or small cell shortly after decoupling activation. The optimization is to adjust the boundaries of the UL-DL imbalance region and/or to adjust the parameters of the user equipment when reporting and/or performing UL-DL re-coupling such that UL-DL decoupling occurs later than currently configured.
In both cases, the embodiments make use of logic in the cell that detects the problem so that an RLF INDICATION type message can be reported to the cell that generated the problem, in which case the cell is informed that UL-DL decoupling was detected as being deactivated too early/too late, or that decoupling was activated too early/too late.
UL and DL problems due to decoupling activation or deactivation can be detected at both the eNB and the user equipment, thus, in certain scenarios, the combination of user equipment and network detection provides an enhanced indication that there is a problem in UL-DL decoupling.
In an embodiment, an RLF INDICATION type message may be sent from the detecting cell to the receiving cell:
c) whenever a fault is detected;
d) after a defined threshold number of failures have occurred within a certain period of time, in that situation
Under the condition, the detecting cell sends a group of fault detection information to the receiving cell;
e) only after a defined threshold number of faults within a certain period of time has been exceeded.
Once the cell responsible for triggering the HS-SCCH order for performing UL-DL decoupling/recoupling has received information about the UL-DL decoupling problem, the UL & DL boundaries of the UL-DL imbalance region can be adjusted appropriately and/or the parameters of the user equipment when reporting and/or performing UL-DL decoupling/recoupling.
Exemplary operations
Fig. 2 shows a user equipment whose UL and DL are decoupled. In this arrangement, the macro cell is used for DL and the small cell is used for UL. In this example, the UL-DL re-coupling (de-coupling deactivation) occurs too late.
The user equipment has been activated by the macro cell for UL-DL decoupling and this situation remains for a while, where DL is from the macro cell and UL is to the small cell.
For LTE, at some point the user equipment detects the DL RLF and re-establishes the radio link connection to the small cell, the user equipment indicates in the RLF-report the following:
the last DL serving cell is a macro cell;
new connection failure type (connectionFailureType) in UE RLF-report value (e.g. UDDF (UL-DL decoupling failure)); and
UL serving cell information (e.g., cell Id of small cell) is also needed as a new information element.
In this example, the small cell also detects RLF of the UL. The small cell reports the event to the macro cell by an RLF indication procedure including user equipment RLF-reporting. For LTE, the RLF indication message may be sent directly from the small cell to the macro cell (over the X2 interface) or via the Core Network (CN), i.e. over the S1 interface between the small cell and the Mobility Management Entity (MME) and between the MME and the macro cell.
The macro cell may then use the information in the RLF INDICATION message to determine whether a failure occurred in the serving (macro) cell.
It is desirable that the macro cell has saved the last few messages and interactions with the user equipment before the user equipment disappears, thus knowing that the last DL message is an activation of UL-DL decoupling and being able to determine if this problem can be avoided if the macro cell has deactivated UL-DL decoupling earlier.
Using the same scheme for UMTS, the user equipment uses a cell update procedure to detect the DL RLF and re-establish the radio link connection to the small cell. Reporting between the small cell and the macro cell may be accomplished using RADIO LINK failure indication (RADIO LINK failure indication) messages. In this case, the radio link failure indication message may be sent from the small cell to the macro cell over an Iub/Iuh & Iu interface.
Those skilled in the art will readily recognize that the steps of the various above-described methods may be performed by a programmable computer. Herein, some embodiments are also intended to encompass program storage devices, e.g., digital data storage media, that are machine or computer readable and encode machine-executable or computer-executable programs of instructions, wherein said instructions perform some or all of the steps of the above-described methods. The program storage device may be, for example, a digital memory, a magnetic storage medium such as a magnetic disk and magnetic tape, a hard disk drive, or an optically readable digital data storage medium. Embodiments are also intended to encompass computers programmed to perform the steps of the methods described above.
The functions of the various elements shown in the figures, including any functional blocks labeled as "processors" or "logic", may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared. Moreover, explicit use of the term "processor" or "controller" or "logic" should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, Digital Signal Processor (DSP) hardware, network processor, Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), Read Only Memory (ROM) for storing software, Random Access Memory (RAM), and non volatile storage. Other hardware, conventional and/or custom, may also be included. Similarly, any switches shown in the figures are conceptual only. Their function may be carried out through the operation of programmed logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
It will be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative circuitry embodying the principles of the invention. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudocode, and the like represent various processes which may be substantially represented in computer readable media and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.
The specification and drawings merely illustrate the principles of the invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown, embody the principles of the invention and are included within its spirit and scope. Moreover, all examples recited herein are principally intended expressly to be only for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof.
Claims (14)
1. A method of a wireless telecommunications network node, comprising:
determining a cause of a radio link failure occurring when a user equipment is in the vicinity of an uplink-downlink imbalance region, the determining comprising: determining that one of the following occurs due to one of uplink-downlink decoupling and uplink-downlink recoupling: too early and too late, and the radio link failure occurs; and
in response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in proximity to the uplink-downlink imbalance region, the step of initiating an action comprising: optimizing control of the user equipment to perform a respective one of uplink-downlink decoupling and uplink-downlink recoupling at a respective one of later and earlier than before.
2. The method of claim 1, wherein the step of determining comprises: it is determined that a radio link failure occurs in the uplink.
3. The method of claim 1 or 2, wherein the step of determining comprises: determining that the radio link failure occurred in an uplink due to at least one of:
when the network node receives above a threshold amount of interference on the uplink, followed by a handover of a user equipment to the network node with a reduction in the interference, uplink-downlink decoupling occurs too late, and the step of initiating an action comprises: optimizing control of the user equipment to perform uplink-downlink decoupling earlier than previously;
uplink-downlink recoupling occurs prematurely when the network node receives above a threshold amount of interference on the uplink following uplink-downlink recoupling of a user equipment, followed by a handover of the user equipment to the network node with a reduction in the interference, and the step of initiating an action comprises: optimizing control of the user equipment to perform uplink-downlink recoupling later than previously;
when the radio link failure in uplink occurs after uplink-downlink recoupling of a user equipment after uplink-downlink decoupling of the user equipment for a predetermined amount of time, uplink-downlink recoupling occurs too late, and the step of initiating action comprises: optimizing control of the user equipment to perform uplink-downlink recoupling earlier than previously; and
when the radio link failure occurs in the uplink within a threshold amount of time after uplink-downlink decoupling of the user equipment, the uplink-downlink decoupling occurs too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling later than before.
4. The method of claim 1 or 2, wherein the step of determining comprises: determining that the radio link failure occurs in a downlink in response to a radio link failure message received from the user equipment.
5. The method of claim 4, wherein the radio link failure message indicates one of the uplink-downlink decoupling and the uplink-downlink recoupling occurs one of: too early and too late.
6. The method of claim 4, wherein the radio link failure message comprises at least one of an indication of a downlink serving cell and an indication of an uplink serving cell at the time of the radio link failure.
7. The method of claim 1, wherein the step of initiating an action comprises: providing an indication of at least one of the cause and the action of the radio link failure to a network node responsible for control of user equipment uplink-downlink decoupling-recoupling when in proximity to an uplink-downlink imbalance region.
8. The method of claim 5 or 7, wherein the step of determining comprises: determining that the radio link failure occurred in uplink in response to at least one of the reason for the radio link failure and the indication of action received from another network node.
9. The method of claim 1 or 2, wherein the step of initiating an action comprises: when more than a threshold amount of radio link failures are determined, an action is initiated to optimize control of user equipment uplink-downlink decoupling-recoupling when in proximity to the uplink-downlink imbalance region.
10. The method of claim 1 or 2, wherein the initiating action step comprises adjusting at least one of: defining uplink and downlink boundaries of the uplink-downlink imbalance zone; and a parameter triggering uplink-downlink decoupling-recoupling of the user equipment.
11. A wireless telecommunications network node, comprising:
determining a logical component operative to:
determining a cause of a radio link failure occurring when a user equipment is in the vicinity of an uplink-downlink imbalance region, the determining being effected by: determining that one of the following occurs due to one of uplink-downlink decoupling and uplink-downlink recoupling: too early and too late, and the radio link failure occurs; and is
In response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of an uplink-downlink imbalance region, the initiating action being accomplished by:
optimizing control of the user equipment to perform a respective one of uplink-downlink decoupling and uplink-downlink recoupling at a respective one of later and earlier than before.
12. A wireless telecommunications user equipment method, comprising:
determining a cause of a radio link failure occurring when a user equipment is in the vicinity of an uplink-downlink imbalance region, the determining comprising: determining that one of the following occurs due to one of uplink-downlink decoupling and uplink-downlink recoupling: too early and too late, and the radio link failure occurs; and
in response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in the vicinity of an uplink-downlink imbalance region, the step of initiating an action comprising: sending a radio link failure message indicating one of the uplink-downlink decoupling and the uplink-downlink recoupling that one of: too early and too late.
13. The method of claim 12, wherein the step of determining comprises: determining that the radio link failure occurred in the downlink due to at least one of:
when a radio link failure occurs on the downlink after a threshold amount of time after uplink-downlink decoupling of the user equipment, uplink-downlink recoupling occurs too late, and the step of initiating action comprises: optimizing control of the user equipment to perform uplink-downlink recoupling earlier than previously;
when the radio link failure occurs in the downlink within a threshold amount of time after uplink-downlink recoupling to a cell that previously received the uplink, uplink-downlink recoupling occurs prematurely, and the step of initiating action comprises: optimizing control of the user equipment to perform uplink-downlink recoupling later than previously;
when the radio link failure occurs in the downlink within a threshold amount of time configured after uplink-downlink decoupling but before uplink-downlink decoupling occurs, uplink-downlink decoupling occurs too late, and the step of initiating action comprises: optimizing control of the user equipment to perform uplink-downlink decoupling earlier than previously; and
when a radio link failure occurs in the downlink within a threshold amount of time after initiating uplink-downlink decoupling, the uplink-downlink decoupling occurs too early, and the step of initiating action comprises: the control of the user equipment is optimized to perform uplink-downlink decoupling later than before.
14. A wireless telecommunications user equipment, comprising:
a determination logic component operable to:
determining a cause of a radio link failure occurring when a user equipment is in the vicinity of an uplink-downlink imbalance region, the determining being effected by: determining that one of the following occurs due to one of uplink-downlink decoupling and uplink-downlink recoupling: too early and too late, and the radio link failure occurs; and is
In response to the cause of the radio link failure, initiating an action to optimize control of user equipment uplink-downlink decoupling-recoupling when in proximity to the uplink-downlink imbalance region, the initiating action being accomplished by: sending a radio link failure message indicating one of the uplink-downlink decoupling and the uplink-downlink recoupling that one of: too early and too late.
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| EP3205169A1 (en) * | 2014-10-08 | 2017-08-16 | Nokia Solutions and Networks Oy | Connection establishment robustness optimization |
| US9848365B2 (en) * | 2015-06-04 | 2017-12-19 | Oceus Networks, Inc. | Dynamic configuration of mobile network entity in a mobile mobile-wireless network (MMWN) |
| TWI578810B (en) * | 2016-02-02 | 2017-04-11 | 財團法人資訊工業策進會 | Small cell, macro cell and transmission assist method for small cell |
| CN106130684A (en) * | 2016-06-27 | 2016-11-16 | 南京邮电大学 | A kind of dense network capacity boost method decoupled based on frequency division multiplexing and up-downgoing |
| WO2018107635A1 (en) * | 2016-12-14 | 2018-06-21 | 华为技术有限公司 | Network failure processing method and device |
| CN113038501B (en) * | 2019-12-24 | 2022-08-05 | 中国移动通信集团四川有限公司 | Network link optimization method and device and electronic equipment |
| CN113573383B (en) * | 2020-04-29 | 2023-04-07 | 京东方科技集团股份有限公司 | Re-network access method after mobile terminal network disconnection and related equipment |
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| EP2854449A1 (en) | 2015-04-01 |
| EP2854449B1 (en) | 2018-01-31 |
| JP2016532344A (en) | 2016-10-13 |
| US10009812B2 (en) | 2018-06-26 |
| US20160234739A1 (en) | 2016-08-11 |
| WO2015043708A1 (en) | 2015-04-02 |
| JP6276395B2 (en) | 2018-02-07 |
| CN105557023A (en) | 2016-05-04 |
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